<template>
  <el-container class="home-container">
    <!-- 头部区 -->
    <el-header>
      <div>
        <img src="../assets/home-logo.jpg" alt="" />
        <span>电商后台管理系统</span>
      </div>
      <el-button type="primary" @click="tuichu">退出</el-button>
    </el-header>
    <!-- 页面主体区域 -->
    <el-container>
      <!-- 侧边栏 -->
      <el-aside :width="ischangeGoggle ? '64px' : '200px'">
        <div class="toggle-button" @click="changeGoggle">|||</div>
        <!-- 侧边栏菜单 -->
        <el-menu
          background-color="#333744"
          text-color="#fff"
          active-text-color="#409EFF"
          unique-opened
          :collapse="ischangeGoggle"
          :collapse-transition="false"
          :default-active="activePath"
          :router="true"
        >
          <!-- 一級菜單 -->
          <!-- 设置独自的index,避免所有同时展开 -->
          <el-submenu
            :index="item.id + ''"
            v-for="item in menulist"
            :key="item.id"
          >
            <!-- 一級菜單模板區 -->
            <template slot="title">
              <i :class="iconObj[item.id]"></i>
              <span>{{ item.authName }}</span>
            </template>
            
            <!-- 二級菜單區  -->
            <el-menu-item
              :index="'/' + subItem.path" 
              v-for="subItem in item.children"
              :key="subItem.id"
              @click="saveNavState('/' + subItem.path)"
            >
              <template slot="title">
                <i class="el-icon-menu"></i>
                <span>{{ subItem.authName }}</span>
              </template>
            </el-menu-item>
          </el-submenu>
        </el-menu>
      </el-aside>
      <!-- 右边内容 -->
      <el-main>
        <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>
</template>

<script>
export default {
  data() {
    return {
      //左侧菜单数据
      menulist: [],
      iconObj:{
        '125':'&#xe8c8',
        '103':'iconfont &#xe602;',
        '101':'iconfont &#xe770;',
        '102':'iconfont &#xe7c7;',
        '145':'iconfont &#xe62d;',
      },
      ischangeGoggle: false,
      //被激活的链接地址
      activePath:''
    }
  },

  //在加载的时候就获取左侧菜单
  created() {
    this.getMenuList()
    this.activePath=window.sessionStorage.getItem('activePath')
  },
  name: 'home',
  methods: {
    tuichu() {
      //方法一清空token,没有token就跳转login
      //方法二编程式导航跳转到login
      window.sessionStorage.removeItem('token')
      this.$router.push('./login')
    },
    //获取所有的菜单
    async getMenuList() {
      const { data: res } = await this.$http.get('menus')
      if (res.meta.status !== 200) return this.$message.error(res.meta.msg)
      this.menulist = res.data
      // console.log(res)
      // console.log(this.menulist)
    },

    //点击按钮切换菜单的折叠
    changeGoggle() {
      this.ischangeGoggle = !this.ischangeGoggle
    },

    //保存链接的激活状态
    saveNavState(activePath){
      window.sessionStorage.setItem('activePath',activePath)
      this.activePath=activePath
    }
  },
}
</script>

<style lang="less" scoped>
.home-container {
  height: 100vh;
  padding: 0;
}
.el-header {
  background-color: #373d41;
  display: flex;
  justify-content: space-between;
  padding-left: 0;
  align-items: center;
  color: #ffff;
  font-size: 20px;
  > div {
    display: flex;
    align-items: center;
    span {
      margin-left: 15px;
    }
    img {
      width: 60px;
      height: 60px;
    }
  }
}
.el-aside {
  background-color: #333744;
  .el-menu {
    border-right: 0px;
  }
}
.el-main {
  background-color: #e0e0e0;
}
.toggle-button {
  background-color: #4a5064;
  font-size: 10px;
  line-height: 24px;
  color: #fff;
  text-align: center;
  letter-spacing: 0.2em;
  cursor: pointer;
}
</style>>

